<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .a{
            width: 1500px;
            height: 52px;
            background: green;
            float: left;
        }
        .b{
            width: 300px;
            height: 400px;
            background: blue;
            float: left;
        }
        .c{
            width: 300px;
            height: 250px;
            background: brown;
            float: left;
        }
    </style>
</head>
<body>
<div class="a"><a href="">页面a</a></div>
<div class="b"><a href="">页面b</a></div>
<div class="c"><a href="">页面c</a></div>

</body>
</html>